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| Section | Objectives |
|---|---|
| Environmentally Assisted Cracking | - Hydrogen-related damage
|
| Metallurgical Damage Mechanisms | - High-temperature degradation
|
| General Knowledge of Damage Mechanisms | - Overview of degradation in refining environments
|
| Refining Process-Specific Damage | - Hydroprocessing units
|
| Materials Selection and Mitigation | - Corrosion control strategies
|
| Corrosion Mechanisms | - High-temperature corrosion
|
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NEW QUESTION # 35
Oxygen and iron in the wash water injected into reactor effluent can lead to __________ corrosion and fouling.
Answer: B
NEW QUESTION # 36
Dissimilar weld metal cracking occurs because the coefficients of thermal expansion between ferritic steels and 300 Series stainless steels differ by ________ or more.
Answer: A
NEW QUESTION # 37
(Creep damage can be mitigated by:)
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
According to API RP 571, creep damage is a time-dependent, high-temperature damage mechanism that occurs when materials are exposed to stress at temperatures typically above about 700 °F (370 °C) for extended periods. Creep damage results in void formation, microcracking, grain boundary separation, and eventual rupture.
Once creep damage has occurred, it is considered irreversible metallurgical degradation. API RP 571 clearly states that heat treatments cannot restore creep life because the material's microstructure has already been permanently damaged.
* Option A (PWHT at 1150 °F) may relieve residual stresses but does not heal creep voids or microcracks.
* Option B (Solution annealing) is applicable to certain stainless steels but is not effective for reversing creep damage, particularly in low-alloy and Cr-Mo steels.
* Option D (Preheating during welding) helps prevent hydrogen-related cracking but has no effect on existing creep damage.
API RP 571 emphasizes that the only effective mitigation for creep damage is to remove the affected material and replace it with sound material, or to retire the component if damage is widespread. Fitness-for- service assessments (API 579-1/ASME FFS-1) may be used to evaluate remaining life, but mitigation requires material removal.
Referenced Documents (Study Basis):
* API RP 571 - Section on Creep and Stress Rupture Damage
* API Corrosion and Materials Study Guide
NEW QUESTION # 38
Creep and stress rupture is more likely in a _________ grained material than a _______ grained material.
Answer: B
NEW QUESTION # 39
(The most effective protection of carbon steel pilings from soil-side corrosion is a combination of a:)
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
According to API RP 571 and corrosion control best practices, maximum protection of buried or soil- exposed carbon steel is achieved by combining:
* A protective coating (primary barrier)
* Cathodic protection (CP) (secondary, active protection)
This dual system:
* Minimizes current demand
* Protects coating defects
* Extends service life significantly
Neither coatings nor CP alone provide equivalent long-term reliability.
Referenced Documents (Study Basis):
* API RP 571 - Section on Soil-Side Corrosion
* API Corrosion Control Study Guide
NEW QUESTION # 40
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